1579281-29-0Relevant academic research and scientific papers
A noble transition metal complex including bisamidine moiety and method for olefin polymerization using the same
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Paragraph 0111-0112; 0125-0127, (2016/10/09)
The present invention relates to a complex compound represented by chemical formula A, and a catalyst composition for polymerizing olefin comprising the same. In the chemical formula A, M, Ar1, Ar2, R1 and R2, and the cyclic group B are the same as described in the detailed description of the invention.COPYRIGHT KIPO 2016
Synthesis of new bis(amidine)-cobalt catalysts and their application to styrene polymerization
Cho, Wonseok,Cho, Hyemin,Lee, Chun Sun,Lee, Bun Yeoul,Moon, Bongjin,Kang, Jahyo
, p. 1617 - 1622 (2014/05/06)
Two new bis(amidine) cobalt(II) complexes were rationally designed and efficiently synthesized. The first synthesized cobalt complex was based on a cyclic bis(amidine) ligand with chiral vicinal diphenyl groups. The structure was verified by single-crystal X-ray crystallography. As expected from the ligand structure, the Co-N bonds in this complex were significantly shorter than those found in the corresponding 1,2-diimine cobalt complex. This indicates that the bis(amidine) ligand has better electron-donating capability than the 1,2-diimine ligand. Upon test polymerization of styrene, the complex exhibited a moderate activity of 5.88 × 105 g PS/(mol Co h). On the basis of this encouraging result, a new 1,2-diaminobenzene-derived bis(amidine) ligand was efficiently synthesized and used to make the corresponding cobalt(II) complex. When subjected to styrene polymerization, the resulting complex showed unusually high polymerization activity [164 × 105 g PS/(mol Co h)] and high conversion (>99%). The resulting polymer was identified as atactic polystyrene by 13C NMR spectroscopy analysis. The significantly enhanced styrene polymerization activity of the 1,2-diaminobenzene-originated bis(amidine) cobalt(II) complex is attributed to the improved electron-donating capability of the ligand.
